Mechanism of methylene blue removal from water by swelling clays

Talc-graphite schist (TGSH) is a natural organo-mineral complex that was derived from the regional metamorphism of organic matter-bearing calcareous clays under the lowest temperature and pressure of the green schist facies (573-632 K and 1-3 Kbars, respectively). The application of TGSH that is widely available in the Meatiq area (Eastern Desert, Egypt) was investigated for the first time ever in the remediation of methylene blue dye (MB) from aqueous solutions. The characterization of the TGSH was carried out using various techniques (XRF, XRD, SEM, FT-IR and BET surface area), and its MB removal capacity was estimated at different experimental conditions. The MB adsorption by TGSH was time-and pH-dependent process, where 120 min was sufficient enough to attain equilibrium. The MB adsorption capacity by the TGSH was directly proportional to the applied temperature, confirming that the MB adsorption process was endothermic in behavior. Based on the determination coefficients, the pseudo-second-order equation (R 2 = 0.939) explained MB adsorption data better than the first-order one (R 2 = 0.653). Meanwhile, intra-particle diffusion was not the sole controlling rate in MB removal by the TGSH. Moreover, the nonlinear regressions of Langmuir model (R 2 = 0.876) explained the equilibrium data better than the other applied models (Temkin, R 2 = 0.793, and Freundlich, R 2 = 0.752). On the other hand, the estimated q max (maximum removal capacity) of Langmuir was 9.41 mg/g at ambient temperature. Hydrogen bonding and electrostatic interaction were the governing mechanisms of MB removal by TGSH with variable impact in accordance with the prevailing pH condition.

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“…7a). These changes confirmed the incorporation of the TGSH linking sites in the MB adsorption [6,46].…”

Section: Characterization Of the Spent Talc-graphite Schistsupporting

confidence: 64%

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

et al. 2020

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“…In contrast, adsorption of AO on Na-montmorillonite only reached to 0.06 mmol/g [27]. Adsorption capacity of methylene blue (MB) on the same montmorillonite was 1.0 mmol/g, corresponding to 0.84 CEC of the mineral [28].…”

Section: Ao Adsorption and Cation Desorptionmentioning

confidence: 83%

Intercalation and configurations of organic dye acridine orange in a high-charge montmorillonite as influenced by dye loading

Liao

et al. 2014

Desalination and Water Treatment

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2014) Intercalation and configurations of organic dye acridine orange in a high-charge montmorillonite as influenced by dye loading, Desalination and Water Treatment, 52:37-39, 7323-7331, A B S T R A C TCationic dyes have strong affinity for negatively charged particle surfaces. The uptake of cationic dyes by clay minerals was attributed to cation exchange. In this study, the mechanism of acridine orange (AO) interaction with a high-charge swelling clay and its interlayer configuration were studied by batch studies, Fourier transform infrared, derivative thermal gravity, and X-ray diffraction (XRD) analyses and assisted by molecular dynamic simulation. At lower loading levels up to 0.8 mmol/g of the clay mineral, the uptake of AO was mainly attributed to cation exchange. At higher AO uptake levels, AO molecular association into a horizontal bilayer would be anticipated in the interlayer of montmorillonite as deduced by the d-spacing expansion on XRD patterns and supported by molecular dynamic simulation. Both the external and internal sorption sites and higher AO adsorption capacity made montmorillonite a superior candidate for the removal of cationic dyes.

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“…As a result, there has been a great interest in developing new adsorbent materials with diverse compositions, properties and functionalities. Although commercial activated carbon is the most widely used adsorbent for dye removal, it is too expensive [9]; consequently, numerous low-cost alternative adsorbents have been proposed including chemically modified sugarcane bagasse lignin [10], pistachio hull waste [11], coffee husk-based activated carbon [12], pine cone [13], rice husk [14], synthetic calcium phosphates [15], natural untreated clay [16], pillared clays [17], and swelling clays [18].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from <i>Lantana camara</i> Stem

Amuda¹,

Olayiwola²,

Alade³

et al. 2014

JEP

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Mechanism of methylene blue removal from water by swelling clays

Cited by 105 publications

References 46 publications

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

Intercalation and configurations of organic dye acridine orange in a high-charge montmorillonite as influenced by dye loading

Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from <i>Lantana camara</i> Stem

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Mechanism of methylene blue removal from water by swelling clays

Cited by 105 publications

References 46 publications

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

Talc-graphite schist as a natural organo-mineral complex for methylene blue remediation: kinetic and isotherm study

Intercalation and configurations of organic dye acridine orange in a high-charge montmorillonite as influenced by dye loading

Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from &lt;i&gt;Lantana camara&lt;/i&gt; Stem

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Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from <i>Lantana camara</i> Stem